Vsynch issue with CRT_emu drivers

[monkeybomb]

Monitor: WG 25 K7193
OS: Win 7 sp1 64 bit (no updates)
Video Card:  VT 4350 PCIe 512mb -  https://www.amazon.com/gp/product/B002AKKMNI/ref=oh_aui_detailpage_o09_s00?ie=UTF8&psc=1
If it matters, the drivers read the card as 4330 instead of 4350.
CRT_Emu Driver version: 2.0 beta - I tried the older driver with the same result on this pc
Using a J-pac with the jumpers on 15 and 31 khz which I believe is the default.

I have things mostly set up, but the picture usually won't stop scrolling no matter what I do with the v-synch dial.  In the event that it does stop scrolling, the top of the screen and the bottom of the screen are flipped.  I used this card with a different computer with the old driver and did get it working, but there were other issues with that pc, so I need to move on.

An additional problem is that the monitor picture is especially dim.  I say especially, because I need a cap kit and the monitor is dim for jamma boards as well.  However, it's much more dim with the pc than any of my real boards.  This was a problem with the other pc as well.

I'm considering just getting an arcadevga.

[brad808]

Sync issues and dim makes it seem like your jpac might not be getting power?

[monkeybomb]

Sync issues and dim makes it seem like your jpac might not be getting power?

Thank you for the suggestion.  How do I trouble shoot and correct that?  Is there a reason the jpac would be getting less power than the jamma boards?  Is there a way to boost the power?

Edit to ask:
Do I need to buy a video amp?  https://www.ultimarc.com/vidamp.html

[brad808]

No you don't need a video amp the jpac already has one built in. The jpac is plugged into the computer correct? And the LEDs are on?

[monkeybomb]

No you don't need a video amp the jpac already has one built in. The jpac is plugged into the computer correct? And the LEDs are on?

I had it connected to the computer correctly, but the 5v connection from the power supply to the jamma harness needed to be disconnected.  I took a look at the jpac faqs after your comment about the power and it says to disconnect low voltage.  Thank you for the help, it works now!

[krick]

If you have a JAMMA power supply in your cabinet, you should disconnect it completely from the AC supply.  Running a power supply without sufficient load can cause a fire.  If you need DC 5v or DC 12v for anything in your cabinet (like coin door lights) you should get it from a molex power connector on your MAME PC.

[monkeybomb]

If you have a JAMMA power supply in your cabinet, you should disconnect it completely from the AC supply.  Running a power supply without sufficient load can cause a fire.  If you need DC 5v or DC 12v for anything in your cabinet (like coin door lights) you should get it from a molex power connector on your MAME PC.

The power supply also goes to the isolation transformer for the monitor.  I assume that's enough, but I didn't even know this risk exists before now.

[krick]

The power supply also goes to the isolation transformer for the monitor.  I assume that's enough, but I didn't even know this risk exists before now.

The power going to the isolation transformer is 110v AC.  It's probably a direct pass-through on the power supply, if it goes through the power supply at all.  The power supply converts the 110v AC to various DC voltages +/-12v, +/-5v, etc...  It shouldn't have anything to do with the isolation transformer unless the two are somehow integrated.